we needed to get a screw out that had been damaged so we used these 

damaged screw remover by Amteker and we had no problems removing , it came out straight away . The set is six piece and gold , which comes in a handy carry plastic case . They are extremely easy to use  ,put  one of drill head to drill a deep hole in the screw head, the speed should not be too fast. then Switch to the end of the thread use the extractor side to remove the screw-bolt and drill out counter clockwise , its that simple .

for more information please click the link below 

https://www.amazon.co.uk/Amteker-Damaged-Screw-Remover-Extractor/dp/B07BJ6S3PL

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